/* Javascript plotting library for jQuery, version 0.8.3.

 Copyright (c) 2007-2014 IOLA and Ole Laursen.
 Licensed under the MIT license.

 */

// first an inline dependency, jquery.colorhelpers.js, we inline it here
// for convenience

/* Plugin for jQuery for working with colors.
 *
 * Version 1.1.
 *
 * Inspiration from jQuery color animation plugin by John Resig.
 *
 * Released under the MIT license by Ole Laursen, October 2009.
 *
 * Examples:
 *
 *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
 *   var c = $.color.extract($("#mydiv"), 'background-color');
 *   console.log(c.r, c.g, c.b, c.a);
 *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
 *
 * Note that .scale() and .add() return the same modified object
 * instead of making a new one.
 *
 * V. 1.1: Fix error handling so e.g. parsing an empty string does
 * produce a color rather than just crashing.
 */
    define(['jquery'],
        function ($) {
            $.color = {};
            $.color.make = function (r, g, b, a) {
                var o = {};
                o.r = r || 0;
                o.g = g || 0;
                o.b = b || 0;
                o.a = a != null ? a : 1;
                o.add = function (c, d) {
                    for (var i = 0; i < c.length; ++i)o[c.charAt(i)] += d;
                    return o.normalize()
                };
                o.scale = function (c, f) {
                    for (var i = 0; i < c.length; ++i)o[c.charAt(i)] *= f;
                    return o.normalize()
                };
                o.toString = function () {
                    if (o.a >= 1) {
                        return "rgb(" + [o.r, o.g, o.b].join(",") + ")"
                    } else {
                        return "rgba(" + [o.r, o.g, o.b, o.a].join(",") + ")"
                    }
                };
                o.normalize = function () {
                    function clamp(min, value, max) {
                        return value < min ? min : value > max ? max : value
                    }

                    o.r = clamp(0, parseInt(o.r), 255);
                    o.g = clamp(0, parseInt(o.g), 255);
                    o.b = clamp(0, parseInt(o.b), 255);
                    o.a = clamp(0, o.a, 1);
                    return o
                };
                o.clone = function () {
                    return $.color.make(o.r, o.b, o.g, o.a)
                };
                return o.normalize()
            };
            $.color.extract = function (elem, css) {
                var c;
                do {
                    c = elem.css(css).toLowerCase();
                    if (c != "" && c != "transparent")break;
                    elem = elem.parent()
                } while (elem.length && !$.nodeName(elem.get(0), "body"));
                if (c == "rgba(0, 0, 0, 0)")c = "transparent";
                return $.color.parse(c)
            };
            $.color.parse = function (str) {
                var res, m = $.color.make;
                if (res = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10));
                if (res = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10), parseFloat(res[4]));
                if (res = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))return m(parseFloat(res[1]) * 2.55, parseFloat(res[2]) * 2.55, parseFloat(res[3]) * 2.55);
                if (res = /rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))return m(parseFloat(res[1]) * 2.55, parseFloat(res[2]) * 2.55, parseFloat(res[3]) * 2.55, parseFloat(res[4]));
                if (res = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))return m(parseInt(res[1], 16), parseInt(res[2], 16), parseInt(res[3], 16));
                if (res = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))return m(parseInt(res[1] + res[1], 16), parseInt(res[2] + res[2], 16), parseInt(res[3] + res[3], 16));
                var name = $.trim(str).toLowerCase();
                if (name == "transparent")return m(255, 255, 255, 0); else {
                    res = lookupColors[name] || [0, 0, 0];
                    return m(res[0], res[1], res[2])
                }
            };
            var lookupColors = {
                aqua: [0, 255, 255],
                azure: [240, 255, 255],
                beige: [245, 245, 220],
                black: [0, 0, 0],
                blue: [0, 0, 255],
                brown: [165, 42, 42],
                cyan: [0, 255, 255],
                darkblue: [0, 0, 139],
                darkcyan: [0, 139, 139],
                darkgrey: [169, 169, 169],
                darkgreen: [0, 100, 0],
                darkkhaki: [189, 183, 107],
                darkmagenta: [139, 0, 139],
                darkolivegreen: [85, 107, 47],
                darkorange: [255, 140, 0],
                darkorchid: [153, 50, 204],
                darkred: [139, 0, 0],
                darksalmon: [233, 150, 122],
                darkviolet: [148, 0, 211],
                fuchsia: [255, 0, 255],
                gold: [255, 215, 0],
                green: [0, 128, 0],
                indigo: [75, 0, 130],
                khaki: [240, 230, 140],
                lightblue: [173, 216, 230],
                lightcyan: [224, 255, 255],
                lightgreen: [144, 238, 144],
                lightgrey: [211, 211, 211],
                lightpink: [255, 182, 193],
                lightyellow: [255, 255, 224],
                lime: [0, 255, 0],
                magenta: [255, 0, 255],
                maroon: [128, 0, 0],
                navy: [0, 0, 128],
                olive: [128, 128, 0],
                orange: [255, 165, 0],
                pink: [255, 192, 203],
                purple: [128, 0, 128],
                violet: [128, 0, 128],
                red: [255, 0, 0],
                silver: [192, 192, 192],
                white: [255, 255, 255],
                yellow: [255, 255, 0]
            };

// Cache the prototype hasOwnProperty for faster access

            var hasOwnProperty = Object.prototype.hasOwnProperty;

// A shim to provide 'detach' to jQuery versions prior to 1.4.  Using a DOM
// operation produces the same effect as detach, i.e. removing the element
// without touching its jQuery data.

// Do not merge this into Flot 0.9, since it requires jQuery 1.4.4+.

            if (!$.fn.detach) {
                $.fn.detach = function () {
                    return this.each(function () {
                        if (this.parentNode) {
                            this.parentNode.removeChild(this);
                        }
                    });
                };
            }

///////////////////////////////////////////////////////////////////////////
// The Canvas object is a wrapper around an HTML5 <canvas> tag.
//
// @constructor
// @param {string} cls List of classes to apply to the canvas.
// @param {element} container Element onto which to append the canvas.
//
// Requiring a container is a little iffy, but unfortunately canvas
// operations don't work unless the canvas is attached to the DOM.

            function Canvas(cls, container) {

                var element = container.children("." + cls)[0];

                if (element == null) {

                    element = document.createElement("canvas");
                    element.className = cls;

                    $(element).css({direction: "ltr", position: "absolute", left: 0, top: 0})
                        .appendTo(container);

                    // If HTML5 Canvas isn't available, fall back to [Ex|Flash]canvas

                    if (!element.getContext) {
                        if (window.G_vmlCanvasManager) {
                            element = window.G_vmlCanvasManager.initElement(element);
                        } else {
                            throw new Error("Canvas is not available. If you're using IE with a fall-back such as Excanvas, then there's either a mistake in your conditional include, or the page has no DOCTYPE and is rendering in Quirks Mode.");
                        }
                    }
                }

                this.element = element;

                var context = this.context = element.getContext("2d");

                // Determine the screen's ratio of physical to device-independent
                // pixels.  This is the ratio between the canvas width that the browser
                // advertises and the number of pixels actually present in that space.

                // The iPhone 4, for example, has a device-independent width of 320px,
                // but its screen is actually 640px wide.  It therefore has a pixel
                // ratio of 2, while most normal devices have a ratio of 1.

                var devicePixelRatio = window.devicePixelRatio || 1,
                    backingStoreRatio =
                        context.webkitBackingStorePixelRatio ||
                        context.mozBackingStorePixelRatio ||
                        context.msBackingStorePixelRatio ||
                        context.oBackingStorePixelRatio ||
                        context.backingStorePixelRatio || 1;

                this.pixelRatio = devicePixelRatio / backingStoreRatio;

                // Size the canvas to match the internal dimensions of its container

                this.resize(container.width(), container.height());

                // Collection of HTML div layers for text overlaid onto the canvas

                this.textContainer = null;
                this.text = {};

                // Cache of text fragments and metrics, so we can avoid expensively
                // re-calculating them when the plot is re-rendered in a loop.

                this._textCache = {};
            }

// Resizes the canvas to the given dimensions.
//
// @param {number} width New width of the canvas, in pixels.
// @param {number} width New height of the canvas, in pixels.

            Canvas.prototype.resize = function (width, height) {

                if (width <= 0 || height <= 0) {
                    throw new Error("Invalid dimensions for plot, width = " + width + ", height = " + height);
                }

                var element = this.element,
                    context = this.context,
                    pixelRatio = this.pixelRatio;

                // Resize the canvas, increasing its density based on the display's
                // pixel ratio; basically giving it more pixels without increasing the
                // size of its element, to take advantage of the fact that retina
                // displays have that many more pixels in the same advertised space.

                // Resizing should reset the state (excanvas seems to be buggy though)

                if (this.width != width) {
                    element.width = width * pixelRatio;
                    element.style.width = width + "px";
                    this.width = width;
                }

                if (this.height != height) {
                    element.height = height * pixelRatio;
                    element.style.height = height + "px";
                    this.height = height;
                }

                // Save the context, so we can reset in case we get replotted.  The
                // restore ensure that we're really back at the initial state, and
                // should be safe even if we haven't saved the initial state yet.

                context.restore();
                context.save();

                // Scale the coordinate space to match the display density; so even though we
                // may have twice as many pixels, we still want lines and other drawing to
                // appear at the same size; the extra pixels will just make them crisper.

                context.scale(pixelRatio, pixelRatio);
            };

// Clears the entire canvas area, not including any overlaid HTML text

            Canvas.prototype.clear = function () {
                this.context.clearRect(0, 0, this.width, this.height);
            };

// Finishes rendering the canvas, including managing the text overlay.

            Canvas.prototype.render = function () {

                var cache = this._textCache;

                // For each text layer, add elements marked as active that haven't
                // already been rendered, and remove those that are no longer active.

                for (var layerKey in cache) {
                    if (hasOwnProperty.call(cache, layerKey)) {

                        var layer = this.getTextLayer(layerKey),
                            layerCache = cache[layerKey];

                        layer.hide();

                        for (var styleKey in layerCache) {
                            if (hasOwnProperty.call(layerCache, styleKey)) {
                                var styleCache = layerCache[styleKey];
                                for (var key in styleCache) {
                                    if (hasOwnProperty.call(styleCache, key)) {

                                        var positions = styleCache[key].positions;

                                        for (var i = 0, position; position = positions[i]; i++) {
                                            if (position.active) {
                                                if (!position.rendered) {
                                                    layer.append(position.element);
                                                    position.rendered = true;
                                                }
                                            } else {
                                                positions.splice(i--, 1);
                                                if (position.rendered) {
                                                    position.element.detach();
                                                }
                                            }
                                        }

                                        if (positions.length == 0) {
                                            delete styleCache[key];
                                        }
                                    }
                                }
                            }
                        }

                        layer.show();
                    }
                }
            };

// Creates (if necessary) and returns the text overlay container.
//
// @param {string} classes String of space-separated CSS classes used to
//     uniquely identify the text layer.
// @return {object} The jQuery-wrapped text-layer div.

            Canvas.prototype.getTextLayer = function (classes) {

                var layer = this.text[classes];

                // Create the text layer if it doesn't exist

                if (layer == null) {

                    // Create the text layer container, if it doesn't exist

                    if (this.textContainer == null) {
                        this.textContainer = $("<div class='flot-text'></div>")
                            .css({
                                position: "absolute",
                                top: 0,
                                left: 0,
                                bottom: 0,
                                right: 0,
                                'font-size': "smaller",
                                color: "#545454"
                            })
                            .insertAfter(this.element);
                    }

                    layer = this.text[classes] = $("<div></div>")
                        .addClass(classes)
                        .css({
                            position: "absolute",
                            top: 0,
                            left: 0,
                            bottom: 0,
                            right: 0
                        })
                        .appendTo(this.textContainer);
                }

                return layer;
            };

// Creates (if necessary) and returns a text info object.
//
// The object looks like this:
//
// {
//     width: Width of the text's wrapper div.
//     height: Height of the text's wrapper div.
//     element: The jQuery-wrapped HTML div containing the text.
//     positions: Array of positions at which this text is drawn.
// }
//
// The positions array contains objects that look like this:
//
// {
//     active: Flag indicating whether the text should be visible.
//     rendered: Flag indicating whether the text is currently visible.
//     element: The jQuery-wrapped HTML div containing the text.
//     x: X coordinate at which to draw the text.
//     y: Y coordinate at which to draw the text.
// }
//
// Each position after the first receives a clone of the original element.
//
// The idea is that that the width, height, and general 'identity' of the
// text is constant no matter where it is placed; the placements are a
// secondary property.
//
// Canvas maintains a cache of recently-used text info objects; getTextInfo
// either returns the cached element or creates a new entry.
//
// @param {string} layer A string of space-separated CSS classes uniquely
//     identifying the layer containing this text.
// @param {string} text Text string to retrieve info for.
// @param {(string|object)=} font Either a string of space-separated CSS
//     classes or a font-spec object, defining the text's font and style.
// @param {number=} angle Angle at which to rotate the text, in degrees.
//     Angle is currently unused, it will be implemented in the future.
// @param {number=} width Maximum width of the text before it wraps.
// @return {object} a text info object.

            Canvas.prototype.getTextInfo = function (layer, text, font, angle, width) {

                var textStyle, layerCache, styleCache, info;

                // Cast the value to a string, in case we were given a number or such

                text = "" + text;

                // If the font is a font-spec object, generate a CSS font definition

                if (typeof font === "object") {
                    textStyle = font.style + " " + font.variant + " " + font.weight + " " + font.size + "px/" + font.lineHeight + "px " + font.family;
                } else {
                    textStyle = font;
                }

                // Retrieve (or create) the cache for the text's layer and styles

                layerCache = this._textCache[layer];

                if (layerCache == null) {
                    layerCache = this._textCache[layer] = {};
                }

                styleCache = layerCache[textStyle];

                if (styleCache == null) {
                    styleCache = layerCache[textStyle] = {};
                }

                info = styleCache[text];

                // If we can't find a matching element in our cache, create a new one

                if (info == null) {

                    var element = $("<div></div>").html(text)
                        .css({
                            position: "absolute",
                            'max-width': width,
                            top: -9999
                        })
                        .appendTo(this.getTextLayer(layer));

                    if (typeof font === "object") {
                        element.css({
                            font: textStyle,
                            color: font.color
                        });
                    } else if (typeof font === "string") {
                        element.addClass(font);
                    }

                    info = styleCache[text] = {
                        width: element.outerWidth(true),
                        height: element.outerHeight(true),
                        element: element,
                        positions: []
                    };

                    element.detach();
                }

                return info;
            };

// Adds a text string to the canvas text overlay.
//
// The text isn't drawn immediately; it is marked as rendering, which will
// result in its addition to the canvas on the next render pass.
//
// @param {string} layer A string of space-separated CSS classes uniquely
//     identifying the layer containing this text.
// @param {number} x X coordinate at which to draw the text.
// @param {number} y Y coordinate at which to draw the text.
// @param {string} text Text string to draw.
// @param {(string|object)=} font Either a string of space-separated CSS
//     classes or a font-spec object, defining the text's font and style.
// @param {number=} angle Angle at which to rotate the text, in degrees.
//     Angle is currently unused, it will be implemented in the future.
// @param {number=} width Maximum width of the text before it wraps.
// @param {string=} halign Horizontal alignment of the text; either "left",
//     "center" or "right".
// @param {string=} valign Vertical alignment of the text; either "top",
//     "middle" or "bottom".

            Canvas.prototype.addText = function (layer, x, y, text, font, angle, width, halign, valign) {

                var info = this.getTextInfo(layer, text, font, angle, width),
                    positions = info.positions;

                // Tweak the div's position to match the text's alignment

                if (halign == "center") {
                    x -= info.width / 2;
                } else if (halign == "right") {
                    x -= info.width;
                }

                if (valign == "middle") {
                    y -= info.height / 2;
                } else if (valign == "bottom") {
                    y -= info.height;
                }

                // Determine whether this text already exists at this position.
                // If so, mark it for inclusion in the next render pass.

                for (var i = 0, position; position = positions[i]; i++) {
                    if (position.x == x && position.y == y) {
                        position.active = true;
                        return;
                    }
                }

                // If the text doesn't exist at this position, create a new entry

                // For the very first position we'll re-use the original element,
                // while for subsequent ones we'll clone it.

                position = {
                    active: true,
                    rendered: false,
                    element: positions.length ? info.element.clone() : info.element,
                    x: x,
                    y: y
                };

                positions.push(position);

                // Move the element to its final position within the container

                position.element.css({
                    top: Math.round(y),
                    left: Math.round(x),
                    'text-align': halign	// In case the text wraps
                });
            };

// Removes one or more text strings from the canvas text overlay.
//
// If no parameters are given, all text within the layer is removed.
//
// Note that the text is not immediately removed; it is simply marked as
// inactive, which will result in its removal on the next render pass.
// This avoids the performance penalty for 'clear and redraw' behavior,
// where we potentially get rid of all text on a layer, but will likely
// add back most or all of it later, as when redrawing axes, for example.
//
// @param {string} layer A string of space-separated CSS classes uniquely
//     identifying the layer containing this text.
// @param {number=} x X coordinate of the text.
// @param {number=} y Y coordinate of the text.
// @param {string=} text Text string to remove.
// @param {(string|object)=} font Either a string of space-separated CSS
//     classes or a font-spec object, defining the text's font and style.
// @param {number=} angle Angle at which the text is rotated, in degrees.
//     Angle is currently unused, it will be implemented in the future.

            Canvas.prototype.removeText = function (layer, x, y, text, font, angle) {
                if (text == null) {
                    var layerCache = this._textCache[layer];
                    if (layerCache != null) {
                        for (var styleKey in layerCache) {
                            if (hasOwnProperty.call(layerCache, styleKey)) {
                                var styleCache = layerCache[styleKey];
                                for (var key in styleCache) {
                                    if (hasOwnProperty.call(styleCache, key)) {
                                        var positions = styleCache[key].positions;
                                        for (var i = 0, position; position = positions[i]; i++) {
                                            position.active = false;
                                        }
                                    }
                                }
                            }
                        }
                    }
                } else {
                    var positions = this.getTextInfo(layer, text, font, angle).positions;
                    for (var i = 0, position; position = positions[i]; i++) {
                        if (position.x == x && position.y == y) {
                            position.active = false;
                        }
                    }
                }
            };

///////////////////////////////////////////////////////////////////////////
// The top-level container for the entire plot.

            function Plot(placeholder, data_, options_, plugins) {
                // data is on the form:
                //   [ series1, series2 ... ]
                // where series is either just the data as [ [x1, y1], [x2, y2], ... ]
                // or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... }

                var series = [],
                    options = {
                        // the color theme used for graphs
                        colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
                        legend: {
                            show: true,
                            noColumns: 1, // number of colums in legend table
                            labelFormatter: null, // fn: string -> string
                            labelBoxBorderColor: "#ccc", // border color for the little label boxes
                            container: null, // container (as jQuery object) to put legend in, null means default on top of graph
                            position: "ne", // position of default legend container within plot
                            margin: 5, // distance from grid edge to default legend container within plot
                            backgroundColor: null, // null means auto-detect
                            backgroundOpacity: 0.85, // set to 0 to avoid background
                            sorted: null    // default to no legend sorting
                        },
                        xaxis: {
                            show: null, // null = auto-detect, true = always, false = never
                            position: "bottom", // or "top"
                            mode: null, // null or "time"
                            font: null, // null (derived from CSS in placeholder) or object like { size: 11, lineHeight: 13, style: "italic", weight: "bold", family: "sans-serif", variant: "small-caps" }
                            color: null, // base color, labels, ticks
                            tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
                            transform: null, // null or f: number -> number to transform axis
                            inverseTransform: null, // if transform is set, this should be the inverse function
                            min: null, // min. value to show, null means set automatically
                            max: null, // max. value to show, null means set automatically
                            autoscaleMargin: null, // margin in % to add if auto-setting min/max
                            ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
                            tickFormatter: null, // fn: number -> string
                            labelWidth: null, // size of tick labels in pixels
                            labelHeight: null,
                            reserveSpace: null, // whether to reserve space even if axis isn't shown
                            tickLength: null, // size in pixels of ticks, or "full" for whole line
                            alignTicksWithAxis: null, // axis number or null for no sync
                            tickDecimals: null, // no. of decimals, null means auto
                            tickSize: null, // number or [number, "unit"]
                            minTickSize: null // number or [number, "unit"]
                        },
                        yaxis: {
                            autoscaleMargin: 0.02,
                            position: "left" // or "right"
                        },
                        xaxes: [],
                        yaxes: [],
                        series: {
                            points: {
                                show: false,
                                radius: 3,
                                lineWidth: 2, // in pixels
                                fill: true,
                                fillColor: "#ffffff",
                                symbol: "circle" // or callback
                            },
                            lines: {
                                // we don't put in show: false so we can see
                                // whether lines were actively disabled
                                lineWidth: 2, // in pixels
                                fill: false,
                                fillColor: null,
                                steps: false
                                // Omit 'zero', so we can later default its value to
                                // match that of the 'fill' option.
                            },
                            bars: {
                                show: false,
                                lineWidth: 2, // in pixels
                                barWidth: 1, // in units of the x axis
                                fill: true,
                                fillColor: null,
                                align: "left", // "left", "right", or "center"
                                horizontal: false,
                                zero: true
                            },
                            shadowSize: 3,
                            highlightColor: null
                        },
                        grid: {
                            show: true,
                            aboveData: false,
                            color: "#545454", // primary color used for outline and labels
                            backgroundColor: null, // null for transparent, else color
                            borderColor: null, // set if different from the grid color
                            tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
                            margin: 0, // distance from the canvas edge to the grid
                            labelMargin: 5, // in pixels
                            axisMargin: 8, // in pixels
                            borderWidth: 2, // in pixels
                            minBorderMargin: null, // in pixels, null means taken from points radius
                            markings: null, // array of ranges or fn: axes -> array of ranges
                            markingsColor: "#f4f4f4",
                            markingsLineWidth: 2,
                            // interactive stuff
                            clickable: false,
                            hoverable: false,
                            autoHighlight: true, // highlight in case mouse is near
                            mouseActiveRadius: 10 // how far the mouse can be away to activate an item
                        },
                        interaction: {
                            redrawOverlayInterval: 1000 / 60 // time between updates, -1 means in same flow
                        },
                        hooks: {}
                    },
                    surface = null,     // the canvas for the plot itself
                    overlay = null,     // canvas for interactive stuff on top of plot
                    eventHolder = null, // jQuery object that events should be bound to
                    ctx = null, octx = null,
                    xaxes = [], yaxes = [],
                    plotOffset = {left: 0, right: 0, top: 0, bottom: 0},
                    plotWidth = 0, plotHeight = 0,
                    hooks = {
                        processOptions: [],
                        processRawData: [],
                        processDatapoints: [],
                        processOffset: [],
                        drawBackground: [],
                        drawSeries: [],
                        draw: [],
                        bindEvents: [],
                        drawOverlay: [],
                        shutdown: []
                    },
                    plot = this;

                // public functions
                plot.setData = setData;
                plot.setupGrid = setupGrid;
                plot.draw = draw;
                plot.getPlaceholder = function () {
                    return placeholder;
                };
                plot.getCanvas = function () {
                    return surface.element;
                };
                plot.getPlotOffset = function () {
                    return plotOffset;
                };
                plot.width = function () {
                    return plotWidth;
                };
                plot.height = function () {
                    return plotHeight;
                };
                plot.offset = function () {
                    var o = eventHolder.offset();
                    o.left += plotOffset.left;
                    o.top += plotOffset.top;
                    return o;
                };
                plot.getData = function () {
                    return series;
                };
                plot.getAxes = function () {
                    var res = {}, i;
                    $.each(xaxes.concat(yaxes), function (_, axis) {
                        if (axis)
                            res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
                    });
                    return res;
                };
                plot.getXAxes = function () {
                    return xaxes;
                };
                plot.getYAxes = function () {
                    return yaxes;
                };
                plot.c2p = canvasToAxisCoords;
                plot.p2c = axisToCanvasCoords;
                plot.getOptions = function () {
                    return options;
                };
                plot.highlight = highlight;
                plot.unhighlight = unhighlight;
                plot.triggerRedrawOverlay = triggerRedrawOverlay;
                plot.pointOffset = function (point) {
                    return {
                        left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left, 10),
                        top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top, 10)
                    };
                };
                plot.shutdown = shutdown;
                plot.destroy = function () {
                    shutdown();
                    placeholder.removeData("plot").empty();

                    series = [];
                    options = null;
                    surface = null;
                    overlay = null;
                    eventHolder = null;
                    ctx = null;
                    octx = null;
                    xaxes = [];
                    yaxes = [];
                    hooks = null;
                    highlights = [];
                    plot = null;
                };
                plot.resize = function () {
                    var width = placeholder.width(),
                        height = placeholder.height();
                    surface.resize(width, height);
                    overlay.resize(width, height);
                };

                // public attributes
                plot.hooks = hooks;

                // initialize
                initPlugins(plot);
                parseOptions(options_);
                setupCanvases();
                setData(data_);
                setupGrid();
                draw();
                bindEvents();


                function executeHooks(hook, args) {
                    args = [plot].concat(args);
                    for (var i = 0; i < hook.length; ++i)
                        hook[i].apply(this, args);
                }

                function initPlugins() {

                    // References to key classes, allowing plugins to modify them

                    var classes = {
                        Canvas: Canvas
                    };

                    for (var i = 0; i < plugins.length; ++i) {
                        var p = plugins[i];
                        p.init(plot, classes);
                        if (p.options)
                            $.extend(true, options, p.options);
                    }
                }

                function parseOptions(opts) {

                    $.extend(true, options, opts);

                    // $.extend merges arrays, rather than replacing them.  When less
                    // colors are provided than the size of the default palette, we
                    // end up with those colors plus the remaining defaults, which is
                    // not expected behavior; avoid it by replacing them here.

                    if (opts && opts.colors) {
                        options.colors = opts.colors;
                    }

                    if (options.xaxis.color == null)
                        options.xaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();
                    if (options.yaxis.color == null)
                        options.yaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();

                    if (options.xaxis.tickColor == null) // grid.tickColor for back-compatibility
                        options.xaxis.tickColor = options.grid.tickColor || options.xaxis.color;
                    if (options.yaxis.tickColor == null) // grid.tickColor for back-compatibility
                        options.yaxis.tickColor = options.grid.tickColor || options.yaxis.color;

                    if (options.grid.borderColor == null)
                        options.grid.borderColor = options.grid.color;
                    if (options.grid.tickColor == null)
                        options.grid.tickColor = $.color.parse(options.grid.color).scale('a', 0.22).toString();

                    // Fill in defaults for axis options, including any unspecified
                    // font-spec fields, if a font-spec was provided.

                    // If no x/y axis options were provided, create one of each anyway,
                    // since the rest of the code assumes that they exist.

                    var i, axisOptions, axisCount,
                        fontSize = placeholder.css("font-size"),
                        fontSizeDefault = fontSize ? +fontSize.replace("px", "") : 13,
                        fontDefaults = {
                            style: placeholder.css("font-style"),
                            size: Math.round(0.8 * fontSizeDefault),
                            variant: placeholder.css("font-variant"),
                            weight: placeholder.css("font-weight"),
                            family: placeholder.css("font-family")
                        };

                    axisCount = options.xaxes.length || 1;
                    for (i = 0; i < axisCount; ++i) {

                        axisOptions = options.xaxes[i];
                        if (axisOptions && !axisOptions.tickColor) {
                            axisOptions.tickColor = axisOptions.color;
                        }

                        axisOptions = $.extend(true, {}, options.xaxis, axisOptions);
                        options.xaxes[i] = axisOptions;

                        if (axisOptions.font) {
                            axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
                            if (!axisOptions.font.color) {
                                axisOptions.font.color = axisOptions.color;
                            }
                            if (!axisOptions.font.lineHeight) {
                                axisOptions.font.lineHeight = Math.round(axisOptions.font.size * 1.15);
                            }
                        }
                    }

                    axisCount = options.yaxes.length || 1;
                    for (i = 0; i < axisCount; ++i) {

                        axisOptions = options.yaxes[i];
                        if (axisOptions && !axisOptions.tickColor) {
                            axisOptions.tickColor = axisOptions.color;
                        }

                        axisOptions = $.extend(true, {}, options.yaxis, axisOptions);
                        options.yaxes[i] = axisOptions;

                        if (axisOptions.font) {
                            axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
                            if (!axisOptions.font.color) {
                                axisOptions.font.color = axisOptions.color;
                            }
                            if (!axisOptions.font.lineHeight) {
                                axisOptions.font.lineHeight = Math.round(axisOptions.font.size * 1.15);
                            }
                        }
                    }

                    // backwards compatibility, to be removed in future
                    if (options.xaxis.noTicks && options.xaxis.ticks == null)
                        options.xaxis.ticks = options.xaxis.noTicks;
                    if (options.yaxis.noTicks && options.yaxis.ticks == null)
                        options.yaxis.ticks = options.yaxis.noTicks;
                    if (options.x2axis) {
                        options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
                        options.xaxes[1].position = "top";
                        // Override the inherit to allow the axis to auto-scale
                        if (options.x2axis.min == null) {
                            options.xaxes[1].min = null;
                        }
                        if (options.x2axis.max == null) {
                            options.xaxes[1].max = null;
                        }
                    }
                    if (options.y2axis) {
                        options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
                        options.yaxes[1].position = "right";
                        // Override the inherit to allow the axis to auto-scale
                        if (options.y2axis.min == null) {
                            options.yaxes[1].min = null;
                        }
                        if (options.y2axis.max == null) {
                            options.yaxes[1].max = null;
                        }
                    }
                    if (options.grid.coloredAreas)
                        options.grid.markings = options.grid.coloredAreas;
                    if (options.grid.coloredAreasColor)
                        options.grid.markingsColor = options.grid.coloredAreasColor;
                    if (options.lines)
                        $.extend(true, options.series.lines, options.lines);
                    if (options.points)
                        $.extend(true, options.series.points, options.points);
                    if (options.bars)
                        $.extend(true, options.series.bars, options.bars);
                    if (options.shadowSize != null)
                        options.series.shadowSize = options.shadowSize;
                    if (options.highlightColor != null)
                        options.series.highlightColor = options.highlightColor;

                    // save options on axes for future reference
                    for (i = 0; i < options.xaxes.length; ++i)
                        getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i];
                    for (i = 0; i < options.yaxes.length; ++i)
                        getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i];

                    // add hooks from options
                    for (var n in hooks)
                        if (options.hooks[n] && options.hooks[n].length)
                            hooks[n] = hooks[n].concat(options.hooks[n]);

                    executeHooks(hooks.processOptions, [options]);
                }

                function setData(d) {
                    series = parseData(d);
                    fillInSeriesOptions();
                    processData();
                }

                function parseData(d) {
                    var res = [];
                    for (var i = 0; i < d.length; ++i) {
                        var s = $.extend(true, {}, options.series);

                        if (d[i].data != null) {
                            s.data = d[i].data; // move the data instead of deep-copy
                            delete d[i].data;

                            $.extend(true, s, d[i]);

                            d[i].data = s.data;
                        }
                        else
                            s.data = d[i];
                        res.push(s);
                    }

                    return res;
                }

                function axisNumber(obj, coord) {
                    var a = obj[coord + "axis"];
                    if (typeof a == "object") // if we got a real axis, extract number
                        a = a.n;
                    if (typeof a != "number")
                        a = 1; // default to first axis
                    return a;
                }

                function allAxes() {
                    // return flat array without annoying null entries
                    return $.grep(xaxes.concat(yaxes), function (a) {
                        return a;
                    });
                }

                function canvasToAxisCoords(pos) {
                    // return an object with x/y corresponding to all used axes
                    var res = {}, i, axis;
                    for (i = 0; i < xaxes.length; ++i) {
                        axis = xaxes[i];
                        if (axis && axis.used)
                            res["x" + axis.n] = axis.c2p(pos.left);
                    }

                    for (i = 0; i < yaxes.length; ++i) {
                        axis = yaxes[i];
                        if (axis && axis.used)
                            res["y" + axis.n] = axis.c2p(pos.top);
                    }

                    if (res.x1 !== undefined)
                        res.x = res.x1;
                    if (res.y1 !== undefined)
                        res.y = res.y1;

                    return res;
                }

                function axisToCanvasCoords(pos) {
                    // get canvas coords from the first pair of x/y found in pos
                    var res = {}, i, axis, key;

                    for (i = 0; i < xaxes.length; ++i) {
                        axis = xaxes[i];
                        if (axis && axis.used) {
                            key = "x" + axis.n;
                            if (pos[key] == null && axis.n == 1)
                                key = "x";

                            if (pos[key] != null) {
                                res.left = axis.p2c(pos[key]);
                                break;
                            }
                        }
                    }

                    for (i = 0; i < yaxes.length; ++i) {
                        axis = yaxes[i];
                        if (axis && axis.used) {
                            key = "y" + axis.n;
                            if (pos[key] == null && axis.n == 1)
                                key = "y";

                            if (pos[key] != null) {
                                res.top = axis.p2c(pos[key]);
                                break;
                            }
                        }
                    }

                    return res;
                }

                function getOrCreateAxis(axes, number) {
                    if (!axes[number - 1])
                        axes[number - 1] = {
                            n: number, // save the number for future reference
                            direction: axes == xaxes ? "x" : "y",
                            options: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
                        };

                    return axes[number - 1];
                }

                function fillInSeriesOptions() {

                    var neededColors = series.length, maxIndex = -1, i;

                    // Subtract the number of series that already have fixed colors or
                    // color indexes from the number that we still need to generate.

                    for (i = 0; i < series.length; ++i) {
                        var sc = series[i].color;
                        if (sc != null) {
                            neededColors--;
                            if (typeof sc == "number" && sc > maxIndex) {
                                maxIndex = sc;
                            }
                        }
                    }

                    // If any of the series have fixed color indexes, then we need to
                    // generate at least as many colors as the highest index.

                    if (neededColors <= maxIndex) {
                        neededColors = maxIndex + 1;
                    }

                    // Generate all the colors, using first the option colors and then
                    // variations on those colors once they're exhausted.

                    var c, colors = [], colorPool = options.colors,
                        colorPoolSize = colorPool.length, variation = 0;

                    for (i = 0; i < neededColors; i++) {

                        c = $.color.parse(colorPool[i % colorPoolSize] || "#666");

                        // Each time we exhaust the colors in the pool we adjust
                        // a scaling factor used to produce more variations on
                        // those colors. The factor alternates negative/positive
                        // to produce lighter/darker colors.

                        // Reset the variation after every few cycles, or else
                        // it will end up producing only white or black colors.

                        if (i % colorPoolSize == 0 && i) {
                            if (variation >= 0) {
                                if (variation < 0.5) {
                                    variation = -variation - 0.2;
                                } else variation = 0;
                            } else variation = -variation;
                        }

                        colors[i] = c.scale('rgb', 1 + variation);
                    }

                    // Finalize the series options, filling in their colors

                    var colori = 0, s;
                    for (i = 0; i < series.length; ++i) {
                        s = series[i];

                        // assign colors
                        if (s.color == null) {
                            s.color = colors[colori].toString();
                            ++colori;
                        }
                        else if (typeof s.color == "number")
                            s.color = colors[s.color].toString();

                        // turn on lines automatically in case nothing is set
                        if (s.lines.show == null) {
                            var v, show = true;
                            for (v in s)
                                if (s[v] && s[v].show) {
                                    show = false;
                                    break;
                                }
                            if (show)
                                s.lines.show = true;
                        }

                        // If nothing was provided for lines.zero, default it to match
                        // lines.fill, since areas by default should extend to zero.

                        if (s.lines.zero == null) {
                            s.lines.zero = !!s.lines.fill;
                        }

                        // setup axes
                        s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x"));
                        s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y"));
                    }
                }

                function processData() {
                    var topSentry = Number.POSITIVE_INFINITY,
                        bottomSentry = Number.NEGATIVE_INFINITY,
                        fakeInfinity = Number.MAX_VALUE,
                        i, j, k, m, length,
                        s, points, ps, x, y, axis, val, f, p,
                        data, format;

                    function updateAxis(axis, min, max) {
                        if (min < axis.datamin && min != -fakeInfinity)
                            axis.datamin = min;
                        if (max > axis.datamax && max != fakeInfinity)
                            axis.datamax = max;
                    }

                    $.each(allAxes(), function (_, axis) {
                        // init axis
                        axis.datamin = topSentry;
                        axis.datamax = bottomSentry;
                        axis.used = false;
                    });

                    for (i = 0; i < series.length; ++i) {
                        s = series[i];
                        s.datapoints = {points: []};

                        executeHooks(hooks.processRawData, [s, s.data, s.datapoints]);
                    }

                    // first pass: clean and copy data
                    for (i = 0; i < series.length; ++i) {
                        s = series[i];

                        data = s.data;
                        format = s.datapoints.format;

                        if (!format) {
                            format = [];
                            // find out how to copy
                            format.push({x: true, number: true, required: true});
                            format.push({y: true, number: true, required: true});

                            if (s.bars.show || (s.lines.show && s.lines.fill)) {
                                var autoscale = !!((s.bars.show && s.bars.zero) || (s.lines.show && s.lines.zero));
                                format.push({y: true, number: true, required: false, defaultValue: 0, autoscale: autoscale});
                                if (s.bars.horizontal) {
                                    delete format[format.length - 1].y;
                                    format[format.length - 1].x = true;
                                }
                            }

                            s.datapoints.format = format;
                        }

                        if (s.datapoints.pointsize != null)
                            continue; // already filled in

                        s.datapoints.pointsize = format.length;

                        ps = s.datapoints.pointsize;
                        points = s.datapoints.points;

                        var insertSteps = s.lines.show && s.lines.steps;
                        s.xaxis.used = s.yaxis.used = true;

                        for (j = k = 0; j < data.length; ++j, k += ps) {
                            p = data[j];

                            var nullify = p == null;
                            if (!nullify) {
                                for (m = 0; m < ps; ++m) {
                                    val = p[m];
                                    f = format[m];

                                    if (f) {
                                        if (f.number && val != null) {
                                            val = +val; // convert to number
                                            if (isNaN(val))
                                                val = null;
                                            else if (val == Infinity)
                                                val = fakeInfinity;
                                            else if (val == -Infinity)
                                                val = -fakeInfinity;
                                        }

                                        if (val == null) {
                                            if (f.required)
                                                nullify = true;

                                            if (f.defaultValue != null)
                                                val = f.defaultValue;
                                        }
                                    }

                                    points[k + m] = val;
                                }
                            }

                            if (nullify) {
                                for (m = 0; m < ps; ++m) {
                                    val = points[k + m];
                                    if (val != null) {
                                        f = format[m];
                                        // extract min/max info
                                        if (f.autoscale !== false) {
                                            if (f.x) {
                                                updateAxis(s.xaxis, val, val);
                                            }
                                            if (f.y) {
                                                updateAxis(s.yaxis, val, val);
                                            }
                                        }
                                    }
                                    points[k + m] = null;
                                }
                            }
                            else {
                                // a little bit of line specific stuff that
                                // perhaps shouldn't be here, but lacking
                                // better means...
                                if (insertSteps && k > 0
                                    && points[k - ps] != null
                                    && points[k - ps] != points[k]
                                    && points[k - ps + 1] != points[k + 1]) {
                                    // copy the point to make room for a middle point
                                    for (m = 0; m < ps; ++m)
                                        points[k + ps + m] = points[k + m];

                                    // middle point has same y
                                    points[k + 1] = points[k - ps + 1];

                                    // we've added a point, better reflect that
                                    k += ps;
                                }
                            }
                        }
                    }

                    // give the hooks a chance to run
                    for (i = 0; i < series.length; ++i) {
                        s = series[i];

                        executeHooks(hooks.processDatapoints, [s, s.datapoints]);
                    }

                    // second pass: find datamax/datamin for auto-scaling
                    for (i = 0; i < series.length; ++i) {
                        s = series[i];
                        points = s.datapoints.points;
                        ps = s.datapoints.pointsize;
                        format = s.datapoints.format;

                        var xmin = topSentry, ymin = topSentry,
                            xmax = bottomSentry, ymax = bottomSentry;

                        for (j = 0; j < points.length; j += ps) {
                            if (points[j] == null)
                                continue;

                            for (m = 0; m < ps; ++m) {
                                val = points[j + m];
                                f = format[m];
                                if (!f || f.autoscale === false || val == fakeInfinity || val == -fakeInfinity)
                                    continue;

                                if (f.x) {
                                    if (val < xmin)
                                        xmin = val;
                                    if (val > xmax)
                                        xmax = val;
                                }
                                if (f.y) {
                                    if (val < ymin)
                                        ymin = val;
                                    if (val > ymax)
                                        ymax = val;
                                }
                            }
                        }

                        if (s.bars.show) {
                            // make sure we got room for the bar on the dancing floor
                            var delta;

                            switch (s.bars.align) {
                                case "left":
                                    delta = 0;
                                    break;
                                case "right":
                                    delta = -s.bars.barWidth;
                                    break;
                                default:
                                    delta = -s.bars.barWidth / 2;
                            }

                            if (s.bars.horizontal) {
                                ymin += delta;
                                ymax += delta + s.bars.barWidth;
                            }
                            else {
                                xmin += delta;
                                xmax += delta + s.bars.barWidth;
                            }
                        }

                        updateAxis(s.xaxis, xmin, xmax);
                        updateAxis(s.yaxis, ymin, ymax);
                    }

                    $.each(allAxes(), function (_, axis) {
                        if (axis.datamin == topSentry)
                            axis.datamin = null;
                        if (axis.datamax == bottomSentry)
                            axis.datamax = null;
                    });
                }

                function setupCanvases() {

                    // Make sure the placeholder is clear of everything except canvases
                    // from a previous plot in this container that we'll try to re-use.

                    placeholder.css("padding", 0) // padding messes up the positioning
                        .children().filter(function () {
                            return !$(this).hasClass("flot-overlay") && !$(this).hasClass('flot-base');
                        }).remove();

                    if (placeholder.css("position") == 'static')
                        placeholder.css("position", "relative"); // for positioning labels and overlay

                    surface = new Canvas("flot-base", placeholder);
                    overlay = new Canvas("flot-overlay", placeholder); // overlay canvas for interactive features

                    ctx = surface.context;
                    octx = overlay.context;

                    // define which element we're listening for events on
                    eventHolder = $(overlay.element).unbind();

                    // If we're re-using a plot object, shut down the old one

                    var existing = placeholder.data("plot");

                    if (existing) {
                        existing.shutdown();
                        overlay.clear();
                    }

                    // save in case we get replotted
                    placeholder.data("plot", plot);
                }

                function bindEvents() {
                    // bind events
                    if (options.grid.hoverable) {
                        eventHolder.mousemove(onMouseMove);

                        // Use bind, rather than .mouseleave, because we officially
                        // still support jQuery 1.2.6, which doesn't define a shortcut
                        // for mouseenter or mouseleave.  This was a bug/oversight that
                        // was fixed somewhere around 1.3.x.  We can return to using
                        // .mouseleave when we drop support for 1.2.6.

                        eventHolder.bind("mouseleave", onMouseLeave);
                    }

                    if (options.grid.clickable)
                        eventHolder.click(onClick);

                    executeHooks(hooks.bindEvents, [eventHolder]);
                }

                function shutdown() {
                    if (redrawTimeout)
                        clearTimeout(redrawTimeout);

                    eventHolder.unbind("mousemove", onMouseMove);
                    eventHolder.unbind("mouseleave", onMouseLeave);
                    eventHolder.unbind("click", onClick);

                    executeHooks(hooks.shutdown, [eventHolder]);
                }

                function setTransformationHelpers(axis) {
                    // set helper functions on the axis, assumes plot area
                    // has been computed already

                    function identity(x) {
                        return x;
                    }

                    var s, m, t = axis.options.transform || identity,
                        it = axis.options.inverseTransform;

                    // precompute how much the axis is scaling a point
                    // in canvas space
                    if (axis.direction == "x") {
                        s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min));
                        m = Math.min(t(axis.max), t(axis.min));
                    }
                    else {
                        s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min));
                        s = -s;
                        m = Math.max(t(axis.max), t(axis.min));
                    }

                    // data point to canvas coordinate
                    if (t == identity) // slight optimization
                        axis.p2c = function (p) {
                            return (p - m) * s;
                        };
                    else
                        axis.p2c = function (p) {
                            return (t(p) - m) * s;
                        };
                    // canvas coordinate to data point
                    if (!it)
                        axis.c2p = function (c) {
                            return m + c / s;
                        };
                    else
                        axis.c2p = function (c) {
                            return it(m + c / s);
                        };
                }

                function measureTickLabels(axis) {

                    var opts = axis.options,
                        ticks = axis.ticks || [],
                        labelWidth = opts.labelWidth || 0,
                        labelHeight = opts.labelHeight || 0,
                        maxWidth = labelWidth || (axis.direction == "x" ? Math.floor(surface.width / (ticks.length || 1)) : null),
                        legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
                        layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                        font = opts.font || "flot-tick-label tickLabel";

                    for (var i = 0; i < ticks.length; ++i) {

                        var t = ticks[i];

                        if (!t.label)
                            continue;

                        var info = surface.getTextInfo(layer, t.label, font, null, maxWidth);

                        labelWidth = Math.max(labelWidth, info.width);
                        labelHeight = Math.max(labelHeight, info.height);
                    }

                    axis.labelWidth = opts.labelWidth || labelWidth;
                    axis.labelHeight = opts.labelHeight || labelHeight;
                }

                function allocateAxisBoxFirstPhase(axis) {
                    // find the bounding box of the axis by looking at label
                    // widths/heights and ticks, make room by diminishing the
                    // plotOffset; this first phase only looks at one
                    // dimension per axis, the other dimension depends on the
                    // other axes so will have to wait

                    var lw = axis.labelWidth,
                        lh = axis.labelHeight,
                        pos = axis.options.position,
                        isXAxis = axis.direction === "x",
                        tickLength = axis.options.tickLength,
                        axisMargin = options.grid.axisMargin,
                        padding = options.grid.labelMargin,
                        innermost = true,
                        outermost = true,
                        first = true,
                        found = false;

                    // Determine the axis's position in its direction and on its side

                    $.each(isXAxis ? xaxes : yaxes, function (i, a) {
                        if (a && (a.show || a.reserveSpace)) {
                            if (a === axis) {
                                found = true;
                            } else if (a.options.position === pos) {
                                if (found) {
                                    outermost = false;
                                } else {
                                    innermost = false;
                                }
                            }
                            if (!found) {
                                first = false;
                            }
                        }
                    });

                    // The outermost axis on each side has no margin

                    if (outermost) {
                        axisMargin = 0;
                    }

                    // The ticks for the first axis in each direction stretch across

                    if (tickLength == null) {
                        tickLength = first ? "full" : 5;
                    }

                    if (!isNaN(+tickLength))
                        padding += +tickLength;

                    if (isXAxis) {
                        lh += padding;

                        if (pos == "bottom") {
                            plotOffset.bottom += lh + axisMargin;
                            axis.box = {top: surface.height - plotOffset.bottom, height: lh};
                        }
                        else {
                            axis.box = {top: plotOffset.top + axisMargin, height: lh};
                            plotOffset.top += lh + axisMargin;
                        }
                    }
                    else {
                        lw += padding;

                        if (pos == "left") {
                            axis.box = {left: plotOffset.left + axisMargin, width: lw};
                            plotOffset.left += lw + axisMargin;
                        }
                        else {
                            plotOffset.right += lw + axisMargin;
                            axis.box = {left: surface.width - plotOffset.right, width: lw};
                        }
                    }

                    // save for future reference
                    axis.position = pos;
                    axis.tickLength = tickLength;
                    axis.box.padding = padding;
                    axis.innermost = innermost;
                }

                function allocateAxisBoxSecondPhase(axis) {
                    // now that all axis boxes have been placed in one
                    // dimension, we can set the remaining dimension coordinates
                    if (axis.direction == "x") {
                        axis.box.left = plotOffset.left - axis.labelWidth / 2;
                        axis.box.width = surface.width - plotOffset.left - plotOffset.right + axis.labelWidth;
                    }
                    else {
                        axis.box.top = plotOffset.top - axis.labelHeight / 2;
                        axis.box.height = surface.height - plotOffset.bottom - plotOffset.top + axis.labelHeight;
                    }
                }

                function adjustLayoutForThingsStickingOut() {
                    // possibly adjust plot offset to ensure everything stays
                    // inside the canvas and isn't clipped off

                    var minMargin = options.grid.minBorderMargin,
                        axis, i;

                    // check stuff from the plot (FIXME: this should just read
                    // a value from the series, otherwise it's impossible to
                    // customize)
                    if (minMargin == null) {
                        minMargin = 0;
                        for (i = 0; i < series.length; ++i)
                            minMargin = Math.max(minMargin, 2 * (series[i].points.radius + series[i].points.lineWidth / 2));
                    }

                    var margins = {
                        left: minMargin,
                        right: minMargin,
                        top: minMargin,
                        bottom: minMargin
                    };

                    // check axis labels, note we don't check the actual
                    // labels but instead use the overall width/height to not
                    // jump as much around with replots
                    $.each(allAxes(), function (_, axis) {
                        if (axis.reserveSpace && axis.ticks && axis.ticks.length) {
                            if (axis.direction === "x") {
                                margins.left = Math.max(margins.left, axis.labelWidth / 2);
                                margins.right = Math.max(margins.right, axis.labelWidth / 2);
                            } else {
                                margins.bottom = Math.max(margins.bottom, axis.labelHeight / 2);
                                margins.top = Math.max(margins.top, axis.labelHeight / 2);
                            }
                        }
                    });

                    plotOffset.left = Math.ceil(Math.max(margins.left, plotOffset.left));
                    plotOffset.right = Math.ceil(Math.max(margins.right, plotOffset.right));
                    plotOffset.top = Math.ceil(Math.max(margins.top, plotOffset.top));
                    plotOffset.bottom = Math.ceil(Math.max(margins.bottom, plotOffset.bottom));
                }

                function setupGrid() {
                    var i, axes = allAxes(), showGrid = options.grid.show;

                    // Initialize the plot's offset from the edge of the canvas

                    for (var a in plotOffset) {
                        var margin = options.grid.margin || 0;
                        plotOffset[a] = typeof margin == "number" ? margin : margin[a] || 0;
                    }

                    executeHooks(hooks.processOffset, [plotOffset]);

                    // If the grid is visible, add its border width to the offset

                    for (var a in plotOffset) {
                        if (typeof(options.grid.borderWidth) == "object") {
                            plotOffset[a] += showGrid ? options.grid.borderWidth[a] : 0;
                        }
                        else {
                            plotOffset[a] += showGrid ? options.grid.borderWidth : 0;
                        }
                    }

                    $.each(axes, function (_, axis) {
                        var axisOpts = axis.options;
                        axis.show = axisOpts.show == null ? axis.used : axisOpts.show;
                        axis.reserveSpace = axisOpts.reserveSpace == null ? axis.show : axisOpts.reserveSpace;
                        setRange(axis);
                    });

                    if (showGrid) {

                        var allocatedAxes = $.grep(axes, function (axis) {
                            return axis.show || axis.reserveSpace;
                        });

                        $.each(allocatedAxes, function (_, axis) {
                            // make the ticks
                            setupTickGeneration(axis);
                            setTicks(axis);
                            snapRangeToTicks(axis, axis.ticks);
                            // find labelWidth/Height for axis
                            measureTickLabels(axis);
                        });

                        // with all dimensions calculated, we can compute the
                        // axis bounding boxes, start from the outside
                        // (reverse order)
                        for (i = allocatedAxes.length - 1; i >= 0; --i)
                            allocateAxisBoxFirstPhase(allocatedAxes[i]);

                        // make sure we've got enough space for things that
                        // might stick out
                        adjustLayoutForThingsStickingOut();

                        $.each(allocatedAxes, function (_, axis) {
                            allocateAxisBoxSecondPhase(axis);
                        });
                    }

                    plotWidth = surface.width - plotOffset.left - plotOffset.right;
                    plotHeight = surface.height - plotOffset.bottom - plotOffset.top;

                    // now we got the proper plot dimensions, we can compute the scaling
                    $.each(axes, function (_, axis) {
                        setTransformationHelpers(axis);
                    });

                    if (showGrid) {
                        drawAxisLabels();
                    }

                    insertLegend();
                }

                function setRange(axis) {
                    var opts = axis.options,
                        min = +(opts.min != null ? opts.min : axis.datamin),
                        max = +(opts.max != null ? opts.max : axis.datamax),
                        delta = max - min;

                    if (delta == 0.0) {
                        // degenerate case
                        var widen = max == 0 ? 1 : 0.01;

                        if (opts.min == null)
                            min -= widen;
                        // always widen max if we couldn't widen min to ensure we
                        // don't fall into min == max which doesn't work
                        if (opts.max == null || opts.min != null)
                            max += widen;
                    }
                    else {
                        // consider autoscaling
                        var margin = opts.autoscaleMargin;
                        if (margin != null) {
                            if (opts.min == null) {
                                min -= delta * margin;
                                // make sure we don't go below zero if all values
                                // are positive
                                if (min < 0 && axis.datamin != null && axis.datamin >= 0)
                                    min = 0;
                            }
                            if (opts.max == null) {
                                max += delta * margin;
                                if (max > 0 && axis.datamax != null && axis.datamax <= 0)
                                    max = 0;
                            }
                        }
                    }
                    axis.min = min;
                    axis.max = max;
                }

                function setupTickGeneration(axis) {
                    var opts = axis.options;

                    // estimate number of ticks
                    var noTicks;
                    if (typeof opts.ticks == "number" && opts.ticks > 0)
                        noTicks = opts.ticks;
                    else
                    // heuristic based on the model a*sqrt(x) fitted to
                    // some data points that seemed reasonable
                        noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? surface.width : surface.height);

                    var delta = (axis.max - axis.min) / noTicks,
                        dec = -Math.floor(Math.log(delta) / Math.LN10),
                        maxDec = opts.tickDecimals;

                    if (maxDec != null && dec > maxDec) {
                        dec = maxDec;
                    }

                    var magn = Math.pow(10, -dec),
                        norm = delta / magn, // norm is between 1.0 and 10.0
                        size;

                    if (norm < 1.5) {
                        size = 1;
                    } else if (norm < 3) {
                        size = 2;
                        // special case for 2.5, requires an extra decimal
                        if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
                            size = 2.5;
                            ++dec;
                        }
                    } else if (norm < 7.5) {
                        size = 5;
                    } else {
                        size = 10;
                    }

                    size *= magn;

                    if (opts.minTickSize != null && size < opts.minTickSize) {
                        size = opts.minTickSize;
                    }

                    axis.delta = delta;
                    axis.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec);
                    axis.tickSize = opts.tickSize || size;

                    // Time mode was moved to a plug-in in 0.8, and since so many people use it
                    // we'll add an especially friendly reminder to make sure they included it.

                    if (opts.mode == "time" && !axis.tickGenerator) {
                        throw new Error("Time mode requires the flot.time plugin.");
                    }

                    // Flot supports base-10 axes; any other mode else is handled by a plug-in,
                    // like flot.time.js.

                    if (!axis.tickGenerator) {

                        axis.tickGenerator = function (axis) {

                            var ticks = [],
                                start = floorInBase(axis.min, axis.tickSize),
                                i = 0,
                                v = Number.NaN,
                                prev;

                            do {
                                prev = v;
                                v = start + i * axis.tickSize;
                                ticks.push(v);
                                ++i;
                            } while (v < axis.max && v != prev);
                            return ticks;
                        };

                        axis.tickFormatter = function (value, axis) {

                            var factor = axis.tickDecimals ? Math.pow(10, axis.tickDecimals) : 1;
                            var formatted = "" + Math.round(value * factor) / factor;

                            // If tickDecimals was specified, ensure that we have exactly that
                            // much precision; otherwise default to the value's own precision.

                            if (axis.tickDecimals != null) {
                                var decimal = formatted.indexOf(".");
                                var precision = decimal == -1 ? 0 : formatted.length - decimal - 1;
                                if (precision < axis.tickDecimals) {
                                    return (precision ? formatted : formatted + ".") + ("" + factor).substr(1, axis.tickDecimals - precision);
                                }
                            }

                            return formatted;
                        };
                    }

                    if ($.isFunction(opts.tickFormatter))
                        axis.tickFormatter = function (v, axis) {
                            return "" + opts.tickFormatter(v, axis);
                        };

                    if (opts.alignTicksWithAxis != null) {
                        var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[opts.alignTicksWithAxis - 1];
                        if (otherAxis && otherAxis.used && otherAxis != axis) {
                            // consider snapping min/max to outermost nice ticks
                            var niceTicks = axis.tickGenerator(axis);
                            if (niceTicks.length > 0) {
                                if (opts.min == null)
                                    axis.min = Math.min(axis.min, niceTicks[0]);
                                if (opts.max == null && niceTicks.length > 1)
                                    axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]);
                            }

                            axis.tickGenerator = function (axis) {
                                // copy ticks, scaled to this axis
                                var ticks = [], v, i;
                                for (i = 0; i < otherAxis.ticks.length; ++i) {
                                    v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min);
                                    v = axis.min + v * (axis.max - axis.min);
                                    ticks.push(v);
                                }
                                return ticks;
                            };

                            // we might need an extra decimal since forced
                            // ticks don't necessarily fit naturally
                            if (!axis.mode && opts.tickDecimals == null) {
                                var extraDec = Math.max(0, -Math.floor(Math.log(axis.delta) / Math.LN10) + 1),
                                    ts = axis.tickGenerator(axis);

                                // only proceed if the tick interval rounded
                                // with an extra decimal doesn't give us a
                                // zero at end
                                if (!(ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec))))
                                    axis.tickDecimals = extraDec;
                            }
                        }
                    }
                }

                function setTicks(axis) {
                    var oticks = axis.options.ticks, ticks = [];
                    if (oticks == null || (typeof oticks == "number" && oticks > 0))
                        ticks = axis.tickGenerator(axis);
                    else if (oticks) {
                        if ($.isFunction(oticks))
                        // generate the ticks
                            ticks = oticks(axis);
                        else
                            ticks = oticks;
                    }

                    // clean up/labelify the supplied ticks, copy them over
                    var i, v;
                    axis.ticks = [];
                    for (i = 0; i < ticks.length; ++i) {
                        var label = null;
                        var t = ticks[i];
                        if (typeof t == "object") {
                            v = +t[0];
                            if (t.length > 1)
                                label = t[1];
                        }
                        else
                            v = +t;
                        if (label == null)
                            label = axis.tickFormatter(v, axis);
                        if (!isNaN(v))
                            axis.ticks.push({v: v, label: label});
                    }
                }

                function snapRangeToTicks(axis, ticks) {
                    if (axis.options.autoscaleMargin && ticks.length > 0) {
                        // snap to ticks
                        if (axis.options.min == null)
                            axis.min = Math.min(axis.min, ticks[0].v);
                        if (axis.options.max == null && ticks.length > 1)
                            axis.max = Math.max(axis.max, ticks[ticks.length - 1].v);
                    }
                }

                function draw() {

                    surface.clear();

                    executeHooks(hooks.drawBackground, [ctx]);

                    var grid = options.grid;

                    // draw background, if any
                    if (grid.show && grid.backgroundColor)
                        drawBackground();

                    if (grid.show && !grid.aboveData) {
                        drawGrid();
                    }

                    for (var i = 0; i < series.length; ++i) {
                        executeHooks(hooks.drawSeries, [ctx, series[i]]);
                        drawSeries(series[i]);
                    }

                    executeHooks(hooks.draw, [ctx]);

                    if (grid.show && grid.aboveData) {
                        drawGrid();
                    }

                    surface.render();

                    // A draw implies that either the axes or data have changed, so we
                    // should probably update the overlay highlights as well.

                    triggerRedrawOverlay();
                }

                function extractRange(ranges, coord) {
                    var axis, from, to, key, axes = allAxes();

                    for (var i = 0; i < axes.length; ++i) {
                        axis = axes[i];
                        if (axis.direction == coord) {
                            key = coord + axis.n + "axis";
                            if (!ranges[key] && axis.n == 1)
                                key = coord + "axis"; // support x1axis as xaxis
                            if (ranges[key]) {
                                from = ranges[key].from;
                                to = ranges[key].to;
                                break;
                            }
                        }
                    }

                    // backwards-compat stuff - to be removed in future
                    if (!ranges[key]) {
                        axis = coord == "x" ? xaxes[0] : yaxes[0];
                        from = ranges[coord + "1"];
                        to = ranges[coord + "2"];
                    }

                    // auto-reverse as an added bonus
                    if (from != null && to != null && from > to) {
                        var tmp = from;
                        from = to;
                        to = tmp;
                    }

                    return {from: from, to: to, axis: axis};
                }

                function drawBackground() {
                    ctx.save();
                    ctx.translate(plotOffset.left, plotOffset.top);

                    ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
                    ctx.fillRect(0, 0, plotWidth, plotHeight);
                    ctx.restore();
                }

                function drawGrid() {
                    var i, axes, bw, bc;

                    ctx.save();
                    ctx.translate(plotOffset.left, plotOffset.top);

                    // draw markings
                    var markings = options.grid.markings;
                    if (markings) {
                        if ($.isFunction(markings)) {
                            axes = plot.getAxes();
                            // xmin etc. is backwards compatibility, to be
                            // removed in the future
                            axes.xmin = axes.xaxis.min;
                            axes.xmax = axes.xaxis.max;
                            axes.ymin = axes.yaxis.min;
                            axes.ymax = axes.yaxis.max;

                            markings = markings(axes);
                        }

                        for (i = 0; i < markings.length; ++i) {
                            var m = markings[i],
                                xrange = extractRange(m, "x"),
                                yrange = extractRange(m, "y");

                            // fill in missing
                            if (xrange.from == null)
                                xrange.from = xrange.axis.min;
                            if (xrange.to == null)
                                xrange.to = xrange.axis.max;
                            if (yrange.from == null)
                                yrange.from = yrange.axis.min;
                            if (yrange.to == null)
                                yrange.to = yrange.axis.max;

                            // clip
                            if (xrange.to < xrange.axis.min || xrange.from > xrange.axis.max ||
                                yrange.to < yrange.axis.min || yrange.from > yrange.axis.max)
                                continue;

                            xrange.from = Math.max(xrange.from, xrange.axis.min);
                            xrange.to = Math.min(xrange.to, xrange.axis.max);
                            yrange.from = Math.max(yrange.from, yrange.axis.min);
                            yrange.to = Math.min(yrange.to, yrange.axis.max);

                            var xequal = xrange.from === xrange.to,
                                yequal = yrange.from === yrange.to;

                            if (xequal && yequal) {
                                continue;
                            }

                            // then draw
                            xrange.from = Math.floor(xrange.axis.p2c(xrange.from));
                            xrange.to = Math.floor(xrange.axis.p2c(xrange.to));
                            yrange.from = Math.floor(yrange.axis.p2c(yrange.from));
                            yrange.to = Math.floor(yrange.axis.p2c(yrange.to));

                            if (xequal || yequal) {
                                var lineWidth = m.lineWidth || options.grid.markingsLineWidth,
                                    subPixel = lineWidth % 2 ? 0.5 : 0;
                                ctx.beginPath();
                                ctx.strokeStyle = m.color || options.grid.markingsColor;
                                ctx.lineWidth = lineWidth;
                                if (xequal) {
                                    ctx.moveTo(xrange.to + subPixel, yrange.from);
                                    ctx.lineTo(xrange.to + subPixel, yrange.to);
                                } else {
                                    ctx.moveTo(xrange.from, yrange.to + subPixel);
                                    ctx.lineTo(xrange.to, yrange.to + subPixel);
                                }
                                ctx.stroke();
                            } else {
                                ctx.fillStyle = m.color || options.grid.markingsColor;
                                ctx.fillRect(xrange.from, yrange.to,
                                    xrange.to - xrange.from,
                                    yrange.from - yrange.to);
                            }
                        }
                    }

                    // draw the ticks
                    axes = allAxes();
                    bw = options.grid.borderWidth;

                    for (var j = 0; j < axes.length; ++j) {
                        var axis = axes[j], box = axis.box,
                            t = axis.tickLength, x, y, xoff, yoff;
                        if (!axis.show || axis.ticks.length == 0)
                            continue;

                        ctx.lineWidth = 1;

                        // find the edges
                        if (axis.direction == "x") {
                            x = 0;
                            if (t == "full")
                                y = (axis.position == "top" ? 0 : plotHeight);
                            else
                                y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0);
                        }
                        else {
                            y = 0;
                            if (t == "full")
                                x = (axis.position == "left" ? 0 : plotWidth);
                            else
                                x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0);
                        }

                        // draw tick bar
                        if (!axis.innermost) {
                            ctx.strokeStyle = axis.options.color;
                            ctx.beginPath();
                            xoff = yoff = 0;
                            if (axis.direction == "x")
                                xoff = plotWidth + 1;
                            else
                                yoff = plotHeight + 1;

                            if (ctx.lineWidth == 1) {
                                if (axis.direction == "x") {
                                    y = Math.floor(y) + 0.5;
                                } else {
                                    x = Math.floor(x) + 0.5;
                                }
                            }

                            ctx.moveTo(x, y);
                            ctx.lineTo(x + xoff, y + yoff);
                            ctx.stroke();
                        }

                        // draw ticks

                        ctx.strokeStyle = axis.options.tickColor;

                        ctx.beginPath();
                        for (i = 0; i < axis.ticks.length; ++i) {
                            var v = axis.ticks[i].v;

                            xoff = yoff = 0;

                            if (isNaN(v) || v < axis.min || v > axis.max
                                    // skip those lying on the axes if we got a border
                                || (t == "full"
                                && ((typeof bw == "object" && bw[axis.position] > 0) || bw > 0)
                                && (v == axis.min || v == axis.max)))
                                continue;

                            if (axis.direction == "x") {
                                x = axis.p2c(v);
                                yoff = t == "full" ? -plotHeight : t;

                                if (axis.position == "top")
                                    yoff = -yoff;
                            }
                            else {
                                y = axis.p2c(v);
                                xoff = t == "full" ? -plotWidth : t;

                                if (axis.position == "left")
                                    xoff = -xoff;
                            }

                            if (ctx.lineWidth == 1) {
                                if (axis.direction == "x")
                                    x = Math.floor(x) + 0.5;
                                else
                                    y = Math.floor(y) + 0.5;
                            }

                            ctx.moveTo(x, y);
                            ctx.lineTo(x + xoff, y + yoff);
                        }

                        ctx.stroke();
                    }


                    // draw border
                    if (bw) {
                        // If either borderWidth or borderColor is an object, then draw the border
                        // line by line instead of as one rectangle
                        bc = options.grid.borderColor;
                        if (typeof bw == "object" || typeof bc == "object") {
                            if (typeof bw !== "object") {
                                bw = {top: bw, right: bw, bottom: bw, left: bw};
                            }
                            if (typeof bc !== "object") {
                                bc = {top: bc, right: bc, bottom: bc, left: bc};
                            }

                            if (bw.top > 0) {
                                ctx.strokeStyle = bc.top;
                                ctx.lineWidth = bw.top;
                                ctx.beginPath();
                                ctx.moveTo(0 - bw.left, 0 - bw.top / 2);
                                ctx.lineTo(plotWidth, 0 - bw.top / 2);
                                ctx.stroke();
                            }

                            if (bw.right > 0) {
                                ctx.strokeStyle = bc.right;
                                ctx.lineWidth = bw.right;
                                ctx.beginPath();
                                ctx.moveTo(plotWidth + bw.right / 2, 0 - bw.top);
                                ctx.lineTo(plotWidth + bw.right / 2, plotHeight);
                                ctx.stroke();
                            }

                            if (bw.bottom > 0) {
                                ctx.strokeStyle = bc.bottom;
                                ctx.lineWidth = bw.bottom;
                                ctx.beginPath();
                                ctx.moveTo(plotWidth + bw.right, plotHeight + bw.bottom / 2);
                                ctx.lineTo(0, plotHeight + bw.bottom / 2);
                                ctx.stroke();
                            }

                            if (bw.left > 0) {
                                ctx.strokeStyle = bc.left;
                                ctx.lineWidth = bw.left;
                                ctx.beginPath();
                                ctx.moveTo(0 - bw.left / 2, plotHeight + bw.bottom);
                                ctx.lineTo(0 - bw.left / 2, 0);
                                ctx.stroke();
                            }
                        }
                        else {
                            ctx.lineWidth = bw;
                            ctx.strokeStyle = options.grid.borderColor;
                            ctx.strokeRect(-bw / 2, -bw / 2, plotWidth + bw, plotHeight + bw);
                        }
                    }

                    ctx.restore();
                }

                function drawAxisLabels() {

                    $.each(allAxes(), function (_, axis) {
                        var box = axis.box,
                            legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
                            layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                            font = axis.options.font || "flot-tick-label tickLabel",
                            tick, x, y, halign, valign;

                        // Remove text before checking for axis.show and ticks.length;
                        // otherwise plugins, like flot-tickrotor, that draw their own
                        // tick labels will end up with both theirs and the defaults.

                        surface.removeText(layer);

                        if (!axis.show || axis.ticks.length == 0)
                            return;

                        for (var i = 0; i < axis.ticks.length; ++i) {

                            tick = axis.ticks[i];
                            if (!tick.label || tick.v < axis.min || tick.v > axis.max)
                                continue;

                            if (axis.direction == "x") {
                                halign = "center";
                                x = plotOffset.left + axis.p2c(tick.v);
                                if (axis.position == "bottom") {
                                    y = box.top + box.padding;
                                } else {
                                    y = box.top + box.height - box.padding;
                                    valign = "bottom";
                                }
                            } else {
                                valign = "middle";
                                y = plotOffset.top + axis.p2c(tick.v);
                                if (axis.position == "left") {
                                    x = box.left + box.width - box.padding;
                                    halign = "right";
                                } else {
                                    x = box.left + box.padding;
                                }
                            }

                            surface.addText(layer, x, y, tick.label, font, null, null, halign, valign);
                        }
                    });
                }

                function drawSeries(series) {
                    if (series.lines.show)
                        drawSeriesLines(series);
                    if (series.bars.show)
                        drawSeriesBars(series);
                    if (series.points.show)
                        drawSeriesPoints(series);
                }

                function drawSeriesLines(series) {
                    function plotLine(datapoints, xoffset, yoffset, axisx, axisy) {
                        var points = datapoints.points,
                            ps = datapoints.pointsize,
                            prevx = null, prevy = null;

                        ctx.beginPath();
                        for (var i = ps; i < points.length; i += ps) {
                            var x1 = points[i - ps], y1 = points[i - ps + 1],
                                x2 = points[i], y2 = points[i + 1];

                            if (x1 == null || x2 == null)
                                continue;

                            // clip with ymin
                            if (y1 <= y2 && y1 < axisy.min) {
                                if (y2 < axisy.min)
                                    continue;   // line segment is outside
                                // compute new intersection point
                                x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y1 = axisy.min;
                            }
                            else if (y2 <= y1 && y2 < axisy.min) {
                                if (y1 < axisy.min)
                                    continue;
                                x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y2 = axisy.min;
                            }

                            // clip with ymax
                            if (y1 >= y2 && y1 > axisy.max) {
                                if (y2 > axisy.max)
                                    continue;
                                x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y1 = axisy.max;
                            }
                            else if (y2 >= y1 && y2 > axisy.max) {
                                if (y1 > axisy.max)
                                    continue;
                                x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y2 = axisy.max;
                            }

                            // clip with xmin
                            if (x1 <= x2 && x1 < axisx.min) {
                                if (x2 < axisx.min)
                                    continue;
                                y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x1 = axisx.min;
                            }
                            else if (x2 <= x1 && x2 < axisx.min) {
                                if (x1 < axisx.min)
                                    continue;
                                y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x2 = axisx.min;
                            }

                            // clip with xmax
                            if (x1 >= x2 && x1 > axisx.max) {
                                if (x2 > axisx.max)
                                    continue;
                                y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x1 = axisx.max;
                            }
                            else if (x2 >= x1 && x2 > axisx.max) {
                                if (x1 > axisx.max)
                                    continue;
                                y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x2 = axisx.max;
                            }

                            if (x1 != prevx || y1 != prevy)
                                ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset);

                            prevx = x2;
                            prevy = y2;
                            ctx.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2) + yoffset);
                        }
                        ctx.stroke();
                    }

                    function plotLineArea(datapoints, axisx, axisy) {
                        var points = datapoints.points,
                            ps = datapoints.pointsize,
                            bottom = Math.min(Math.max(0, axisy.min), axisy.max),
                            i = 0, top, areaOpen = false,
                            ypos = 1, segmentStart = 0, segmentEnd = 0;

                        // we process each segment in two turns, first forward
                        // direction to sketch out top, then once we hit the
                        // end we go backwards to sketch the bottom
                        while (true) {
                            if (ps > 0 && i > points.length + ps)
                                break;

                            i += ps; // ps is negative if going backwards

                            var x1 = points[i - ps],
                                y1 = points[i - ps + ypos],
                                x2 = points[i], y2 = points[i + ypos];

                            if (areaOpen) {
                                if (ps > 0 && x1 != null && x2 == null) {
                                    // at turning point
                                    segmentEnd = i;
                                    ps = -ps;
                                    ypos = 2;
                                    continue;
                                }

                                if (ps < 0 && i == segmentStart + ps) {
                                    // done with the reverse sweep
                                    ctx.fill();
                                    areaOpen = false;
                                    ps = -ps;
                                    ypos = 1;
                                    i = segmentStart = segmentEnd + ps;
                                    continue;
                                }
                            }

                            if (x1 == null || x2 == null)
                                continue;

                            // clip x values

                            // clip with xmin
                            if (x1 <= x2 && x1 < axisx.min) {
                                if (x2 < axisx.min)
                                    continue;
                                y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x1 = axisx.min;
                            }
                            else if (x2 <= x1 && x2 < axisx.min) {
                                if (x1 < axisx.min)
                                    continue;
                                y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x2 = axisx.min;
                            }

                            // clip with xmax
                            if (x1 >= x2 && x1 > axisx.max) {
                                if (x2 > axisx.max)
                                    continue;
                                y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x1 = axisx.max;
                            }
                            else if (x2 >= x1 && x2 > axisx.max) {
                                if (x1 > axisx.max)
                                    continue;
                                y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                                x2 = axisx.max;
                            }

                            if (!areaOpen) {
                                // open area
                                ctx.beginPath();
                                ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
                                areaOpen = true;
                            }

                            // now first check the case where both is outside
                            if (y1 >= axisy.max && y2 >= axisy.max) {
                                ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
                                ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
                                continue;
                            }
                            else if (y1 <= axisy.min && y2 <= axisy.min) {
                                ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
                                ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
                                continue;
                            }

                            // else it's a bit more complicated, there might
                            // be a flat maxed out rectangle first, then a
                            // triangular cutout or reverse; to find these
                            // keep track of the current x values
                            var x1old = x1, x2old = x2;

                            // clip the y values, without shortcutting, we
                            // go through all cases in turn

                            // clip with ymin
                            if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
                                x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y1 = axisy.min;
                            }
                            else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
                                x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y2 = axisy.min;
                            }

                            // clip with ymax
                            if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
                                x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y1 = axisy.max;
                            }
                            else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
                                x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                                y2 = axisy.max;
                            }

                            // if the x value was changed we got a rectangle
                            // to fill
                            if (x1 != x1old) {
                                ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
                                // it goes to (x1, y1), but we fill that below
                            }

                            // fill triangular section, this sometimes result
                            // in redundant points if (x1, y1) hasn't changed
                            // from previous line to, but we just ignore that
                            ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
                            ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));

                            // fill the other rectangle if it's there
                            if (x2 != x2old) {
                                ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
                                ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
                            }
                        }
                    }

                    ctx.save();
                    ctx.translate(plotOffset.left, plotOffset.top);
                    ctx.lineJoin = "round";

                    var lw = series.lines.lineWidth,
                        sw = series.shadowSize;
                    // FIXME: consider another form of shadow when filling is turned on
                    if (lw > 0 && sw > 0) {
                        // draw shadow as a thick and thin line with transparency
                        ctx.lineWidth = sw;
                        ctx.strokeStyle = "rgba(0,0,0,0.1)";
                        // position shadow at angle from the mid of line
                        var angle = Math.PI / 18;
                        plotLine(series.datapoints, Math.sin(angle) * (lw / 2 + sw / 2), Math.cos(angle) * (lw / 2 + sw / 2), series.xaxis, series.yaxis);
                        ctx.lineWidth = sw / 2;
                        plotLine(series.datapoints, Math.sin(angle) * (lw / 2 + sw / 4), Math.cos(angle) * (lw / 2 + sw / 4), series.xaxis, series.yaxis);
                    }

                    ctx.lineWidth = lw;
                    ctx.strokeStyle = series.color;
                    var fillStyle = getFillStyle(series.lines, series.color, 0, plotHeight);
                    if (fillStyle) {
                        ctx.fillStyle = fillStyle;
                        plotLineArea(series.datapoints, series.xaxis, series.yaxis);
                    }

                    if (lw > 0)
                        plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis);
                    ctx.restore();
                }

                function drawSeriesPoints(series) {
                    function plotPoints(datapoints, radius, fillStyle, offset, shadow, axisx, axisy, symbol) {
                        var points = datapoints.points, ps = datapoints.pointsize;

                        for (var i = 0; i < points.length; i += ps) {
                            var x = points[i], y = points[i + 1];
                            if (x == null || x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
                                continue;

                            ctx.beginPath();
                            x = axisx.p2c(x);
                            y = axisy.p2c(y) + offset;
                            if (symbol == "circle")
                                ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
                            else
                                symbol(ctx, x, y, radius, shadow);
                            ctx.closePath();

                            if (fillStyle) {
                                ctx.fillStyle = fillStyle;
                                ctx.fill();
                            }
                            ctx.stroke();
                        }
                    }

                    ctx.save();
                    ctx.translate(plotOffset.left, plotOffset.top);

                    var lw = series.points.lineWidth,
                        sw = series.shadowSize,
                        radius = series.points.radius,
                        symbol = series.points.symbol;

                    // If the user sets the line width to 0, we change it to a very
                    // small value. A line width of 0 seems to force the default of 1.
                    // Doing the conditional here allows the shadow setting to still be
                    // optional even with a lineWidth of 0.

                    if (lw == 0)
                        lw = 0.0001;

                    if (lw > 0 && sw > 0) {
                        // draw shadow in two steps
                        var w = sw / 2;
                        ctx.lineWidth = w;
                        ctx.strokeStyle = "rgba(0,0,0,0.1)";
                        plotPoints(series.datapoints, radius, null, w + w / 2, true,
                            series.xaxis, series.yaxis, symbol);

                        ctx.strokeStyle = "rgba(0,0,0,0.2)";
                        plotPoints(series.datapoints, radius, null, w / 2, true,
                            series.xaxis, series.yaxis, symbol);
                    }

                    ctx.lineWidth = lw;
                    ctx.strokeStyle = series.color;
                    plotPoints(series.datapoints, radius,
                        getFillStyle(series.points, series.color), 0, false,
                        series.xaxis, series.yaxis, symbol);
                    ctx.restore();
                }

                function drawBar(x, y, b, barLeft, barRight, fillStyleCallback, axisx, axisy, c, horizontal, lineWidth) {
                    var left, right, bottom, top,
                        drawLeft, drawRight, drawTop, drawBottom,
                        tmp;

                    // in horizontal mode, we start the bar from the left
                    // instead of from the bottom so it appears to be
                    // horizontal rather than vertical
                    if (horizontal) {
                        drawBottom = drawRight = drawTop = true;
                        drawLeft = false;
                        left = b;
                        right = x;
                        top = y + barLeft;
                        bottom = y + barRight;

                        // account for negative bars
                        if (right < left) {
                            tmp = right;
                            right = left;
                            left = tmp;
                            drawLeft = true;
                            drawRight = false;
                        }
                    }
                    else {
                        drawLeft = drawRight = drawTop = true;
                        drawBottom = false;
                        left = x + barLeft;
                        right = x + barRight;
                        bottom = b;
                        top = y;

                        // account for negative bars
                        if (top < bottom) {
                            tmp = top;
                            top = bottom;
                            bottom = tmp;
                            drawBottom = true;
                            drawTop = false;
                        }
                    }

                    // clip
                    if (right < axisx.min || left > axisx.max ||
                        top < axisy.min || bottom > axisy.max)
                        return;

                    if (left < axisx.min) {
                        left = axisx.min;
                        drawLeft = false;
                    }

                    if (right > axisx.max) {
                        right = axisx.max;
                        drawRight = false;
                    }

                    if (bottom < axisy.min) {
                        bottom = axisy.min;
                        drawBottom = false;
                    }

                    if (top > axisy.max) {
                        top = axisy.max;
                        drawTop = false;
                    }

                    left = axisx.p2c(left);
                    bottom = axisy.p2c(bottom);
                    right = axisx.p2c(right);
                    top = axisy.p2c(top);

                    // fill the bar
                    if (fillStyleCallback) {
                        c.fillStyle = fillStyleCallback(bottom, top);
                        c.fillRect(left, top, right - left, bottom - top)
                    }

                    // draw outline
                    if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
                        c.beginPath();

                        // FIXME: inline moveTo is buggy with excanvas
                        c.moveTo(left, bottom);
                        if (drawLeft)
                            c.lineTo(left, top);
                        else
                            c.moveTo(left, top);
                        if (drawTop)
                            c.lineTo(right, top);
                        else
                            c.moveTo(right, top);
                        if (drawRight)
                            c.lineTo(right, bottom);
                        else
                            c.moveTo(right, bottom);
                        if (drawBottom)
                            c.lineTo(left, bottom);
                        else
                            c.moveTo(left, bottom);
                        c.stroke();
                    }
                }

                function drawSeriesBars(series) {
                    function plotBars(datapoints, barLeft, barRight, fillStyleCallback, axisx, axisy) {
                        var points = datapoints.points, ps = datapoints.pointsize;

                        for (var i = 0; i < points.length; i += ps) {
                            if (points[i] == null)
                                continue;
                            drawBar(points[i], points[i + 1], points[i + 2], barLeft, barRight, fillStyleCallback, axisx, axisy, ctx, series.bars.horizontal, series.bars.lineWidth);
                        }
                    }

                    ctx.save();
                    ctx.translate(plotOffset.left, plotOffset.top);

                    // FIXME: figure out a way to add shadows (for instance along the right edge)
                    ctx.lineWidth = series.bars.lineWidth;
                    ctx.strokeStyle = series.color;

                    var barLeft;

                    switch (series.bars.align) {
                        case "left":
                            barLeft = 0;
                            break;
                        case "right":
                            barLeft = -series.bars.barWidth;
                            break;
                        default:
                            barLeft = -series.bars.barWidth / 2;
                    }

                    var fillStyleCallback = series.bars.fill ? function (bottom, top) {
                        return getFillStyle(series.bars, series.color, bottom, top);
                    } : null;
                    plotBars(series.datapoints, barLeft, barLeft + series.bars.barWidth, fillStyleCallback, series.xaxis, series.yaxis);
                    ctx.restore();
                }

                function getFillStyle(filloptions, seriesColor, bottom, top) {
                    var fill = filloptions.fill;
                    if (!fill)
                        return null;

                    if (filloptions.fillColor)
                        return getColorOrGradient(filloptions.fillColor, bottom, top, seriesColor);

                    var c = $.color.parse(seriesColor);
                    c.a = typeof fill == "number" ? fill : 0.4;
                    c.normalize();
                    return c.toString();
                }

                function insertLegend() {

                    if (options.legend.container != null) {
                        $(options.legend.container).html("");
                    } else {
                        placeholder.find(".legend").remove();
                    }

                    if (!options.legend.show) {
                        return;
                    }

                    var fragments = [], entries = [], rowStarted = false,
                        lf = options.legend.labelFormatter, s, label;

                    // Build a list of legend entries, with each having a label and a color

                    for (var i = 0; i < series.length; ++i) {
                        s = series[i];
                        if (s.label) {
                            label = lf ? lf(s.label, s) : s.label;
                            if (label) {
                                entries.push({
                                    label: label,
                                    color: s.color
                                });
                            }
                        }
                    }

                    // Sort the legend using either the default or a custom comparator

                    if (options.legend.sorted) {
                        if ($.isFunction(options.legend.sorted)) {
                            entries.sort(options.legend.sorted);
                        } else if (options.legend.sorted == "reverse") {
                            entries.reverse();
                        } else {
                            var ascending = options.legend.sorted != "descending";
                            entries.sort(function (a, b) {
                                return a.label == b.label ? 0 : (
                                    (a.label < b.label) != ascending ? 1 : -1   // Logical XOR
                                );
                            });
                        }
                    }

                    // Generate markup for the list of entries, in their final order

                    for (var i = 0; i < entries.length; ++i) {

                        var entry = entries[i];

                        if (i % options.legend.noColumns == 0) {
                            if (rowStarted)
                                fragments.push('</tr>');
                            fragments.push('<tr>');
                            rowStarted = true;
                        }

                        fragments.push(
                            '<td class="legendColorBox"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:4px;height:0;border:5px solid ' + entry.color + ';overflow:hidden"></div></div></td>' +
                            '<td class="legendLabel">' + entry.label + '</td>'
                        );
                    }

                    if (rowStarted)
                        fragments.push('</tr>');

                    if (fragments.length == 0)
                        return;

                    var table = '<table style="font-size:smaller;color:' + options.grid.color + '">' + fragments.join("") + '</table>';
                    if (options.legend.container != null)
                        $(options.legend.container).html(table);
                    else {
                        var pos = "",
                            p = options.legend.position,
                            m = options.legend.margin;
                        if (m[0] == null)
                            m = [m, m];
                        if (p.charAt(0) == "n")
                            pos += 'top:' + (m[1] + plotOffset.top) + 'px;';
                        else if (p.charAt(0) == "s")
                            pos += 'bottom:' + (m[1] + plotOffset.bottom) + 'px;';
                        if (p.charAt(1) == "e")
                            pos += 'right:' + (m[0] + plotOffset.right) + 'px;';
                        else if (p.charAt(1) == "w")
                            pos += 'left:' + (m[0] + plotOffset.left) + 'px;';
                        var legend = $('<div class="legend">' + table.replace('style="', 'style="position:absolute;' + pos + ';') + '</div>').appendTo(placeholder);
                        if (options.legend.backgroundOpacity != 0.0) {
                            // put in the transparent background
                            // separately to avoid blended labels and
                            // label boxes
                            var c = options.legend.backgroundColor;
                            if (c == null) {
                                c = options.grid.backgroundColor;
                                if (c && typeof c == "string")
                                    c = $.color.parse(c);
                                else
                                    c = $.color.extract(legend, 'background-color');
                                c.a = 1;
                                c = c.toString();
                            }
                            var div = legend.children();
                            $('<div style="position:absolute;width:' + div.width() + 'px;height:' + div.height() + 'px;' + pos + 'background-color:' + c + ';"> </div>').prependTo(legend).css('opacity', options.legend.backgroundOpacity);
                        }
                    }
                }


                // interactive features

                var highlights = [],
                    redrawTimeout = null;

                // returns the data item the mouse is over, or null if none is found
                function findNearbyItem(mouseX, mouseY, seriesFilter) {
                    var maxDistance = options.grid.mouseActiveRadius,
                        smallestDistance = maxDistance * maxDistance + 1,
                        item = null, foundPoint = false, i, j, ps;

                    for (i = series.length - 1; i >= 0; --i) {
                        if (!seriesFilter(series[i]))
                            continue;

                        var s = series[i],
                            axisx = s.xaxis,
                            axisy = s.yaxis,
                            points = s.datapoints.points,
                            mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster
                            my = axisy.c2p(mouseY),
                            maxx = maxDistance / axisx.scale,
                            maxy = maxDistance / axisy.scale;

                        ps = s.datapoints.pointsize;
                        // with inverse transforms, we can't use the maxx/maxy
                        // optimization, sadly
                        if (axisx.options.inverseTransform)
                            maxx = Number.MAX_VALUE;
                        if (axisy.options.inverseTransform)
                            maxy = Number.MAX_VALUE;

                        if (s.lines.show || s.points.show) {
                            for (j = 0; j < points.length; j += ps) {
                                var x = points[j], y = points[j + 1];
                                if (x == null)
                                    continue;

                                // For points and lines, the cursor must be within a
                                // certain distance to the data point
                                if (x - mx > maxx || x - mx < -maxx ||
                                    y - my > maxy || y - my < -maxy)
                                    continue;

                                // We have to calculate distances in pixels, not in
                                // data units, because the scales of the axes may be different
                                var dx = Math.abs(axisx.p2c(x) - mouseX),
                                    dy = Math.abs(axisy.p2c(y) - mouseY),
                                    dist = dx * dx + dy * dy; // we save the sqrt

                                // use <= to ensure last point takes precedence
                                // (last generally means on top of)
                                if (dist < smallestDistance) {
                                    smallestDistance = dist;
                                    item = [i, j / ps];
                                }
                            }
                        }

                        if (s.bars.show && !item) { // no other point can be nearby

                            var barLeft, barRight;

                            switch (s.bars.align) {
                                case "left":
                                    barLeft = 0;
                                    break;
                                case "right":
                                    barLeft = -s.bars.barWidth;
                                    break;
                                default:
                                    barLeft = -s.bars.barWidth / 2;
                            }

                            barRight = barLeft + s.bars.barWidth;

                            for (j = 0; j < points.length; j += ps) {
                                var x = points[j], y = points[j + 1], b = points[j + 2];
                                if (x == null)
                                    continue;

                                // for a bar graph, the cursor must be inside the bar
                                if (series[i].bars.horizontal ?
                                        (mx <= Math.max(b, x) && mx >= Math.min(b, x) &&
                                        my >= y + barLeft && my <= y + barRight) :
                                        (mx >= x + barLeft && mx <= x + barRight &&
                                        my >= Math.min(b, y) && my <= Math.max(b, y)))
                                    item = [i, j / ps];
                            }
                        }
                    }

                    if (item) {
                        i = item[0];
                        j = item[1];
                        ps = series[i].datapoints.pointsize;

                        return {
                            datapoint: series[i].datapoints.points.slice(j * ps, (j + 1) * ps),
                            dataIndex: j,
                            series: series[i],
                            seriesIndex: i
                        };
                    }

                    return null;
                }

                function onMouseMove(e) {
                    if (options.grid.hoverable)
                        triggerClickHoverEvent("plothover", e,
                            function (s) {
                                return s["hoverable"] != false;
                            });
                }

                function onMouseLeave(e) {
                    if (options.grid.hoverable)
                        triggerClickHoverEvent("plothover", e,
                            function (s) {
                                return false;
                            });
                }

                function onClick(e) {
                    triggerClickHoverEvent("plotclick", e,
                        function (s) {
                            return s["clickable"] != false;
                        });
                }

                // trigger click or hover event (they send the same parameters
                // so we share their code)
                function triggerClickHoverEvent(eventname, event, seriesFilter) {
                    var offset = eventHolder.offset(),
                        canvasX = event.pageX - offset.left - plotOffset.left,
                        canvasY = event.pageY - offset.top - plotOffset.top,
                        pos = canvasToAxisCoords({left: canvasX, top: canvasY});

                    pos.pageX = event.pageX;
                    pos.pageY = event.pageY;

                    var item = findNearbyItem(canvasX, canvasY, seriesFilter);

                    if (item) {
                        // fill in mouse pos for any listeners out there
                        item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left, 10);
                        item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top, 10);
                    }

                    if (options.grid.autoHighlight) {
                        // clear auto-highlights
                        for (var i = 0; i < highlights.length; ++i) {
                            var h = highlights[i];
                            if (h.auto == eventname && !(item && h.series == item.series &&
                                h.point[0] == item.datapoint[0] &&
                                h.point[1] == item.datapoint[1]))
                                unhighlight(h.series, h.point);
                        }

                        if (item)
                            highlight(item.series, item.datapoint, eventname);
                    }

                    placeholder.trigger(eventname, [pos, item]);
                }

                function triggerRedrawOverlay() {
                    var t = options.interaction.redrawOverlayInterval;
                    if (t == -1) {      // skip event queue
                        drawOverlay();
                        return;
                    }

                    if (!redrawTimeout)
                        redrawTimeout = setTimeout(drawOverlay, t);
                }

                function drawOverlay() {
                    redrawTimeout = null;

                    // draw highlights
                    octx.save();
                    overlay.clear();
                    octx.translate(plotOffset.left, plotOffset.top);

                    var i, hi;
                    for (i = 0; i < highlights.length; ++i) {
                        hi = highlights[i];

                        if (hi.series.bars.show)
                            drawBarHighlight(hi.series, hi.point);
                        else
                            drawPointHighlight(hi.series, hi.point);
                    }
                    octx.restore();

                    executeHooks(hooks.drawOverlay, [octx]);
                }

                function highlight(s, point, auto) {
                    if (typeof s == "number")
                        s = series[s];

                    if (typeof point == "number") {
                        var ps = s.datapoints.pointsize;
                        point = s.datapoints.points.slice(ps * point, ps * (point + 1));
                    }

                    var i = indexOfHighlight(s, point);
                    if (i == -1) {
                        highlights.push({series: s, point: point, auto: auto});

                        triggerRedrawOverlay();
                    }
                    else if (!auto)
                        highlights[i].auto = false;
                }

                function unhighlight(s, point) {
                    if (s == null && point == null) {
                        highlights = [];
                        triggerRedrawOverlay();
                        return;
                    }

                    if (typeof s == "number")
                        s = series[s];

                    if (typeof point == "number") {
                        var ps = s.datapoints.pointsize;
                        point = s.datapoints.points.slice(ps * point, ps * (point + 1));
                    }

                    var i = indexOfHighlight(s, point);
                    if (i != -1) {
                        highlights.splice(i, 1);

                        triggerRedrawOverlay();
                    }
                }

                function indexOfHighlight(s, p) {
                    for (var i = 0; i < highlights.length; ++i) {
                        var h = highlights[i];
                        if (h.series == s && h.point[0] == p[0]
                            && h.point[1] == p[1])
                            return i;
                    }
                    return -1;
                }

                function drawPointHighlight(series, point) {
                    var x = point[0], y = point[1],
                        axisx = series.xaxis, axisy = series.yaxis,
                        highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString();

                    if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
                        return;

                    var pointRadius = series.points.radius + series.points.lineWidth / 2;
                    octx.lineWidth = pointRadius;
                    octx.strokeStyle = highlightColor;
                    var radius = 1.5 * pointRadius;
                    x = axisx.p2c(x);
                    y = axisy.p2c(y);

                    octx.beginPath();
                    if (series.points.symbol == "circle")
                        octx.arc(x, y, radius, 0, 2 * Math.PI, false);
                    else
                        series.points.symbol(octx, x, y, radius, false);
                    octx.closePath();
                    octx.stroke();
                }

                function drawBarHighlight(series, point) {
                    var highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString(),
                        fillStyle = highlightColor,
                        barLeft;

                    switch (series.bars.align) {
                        case "left":
                            barLeft = 0;
                            break;
                        case "right":
                            barLeft = -series.bars.barWidth;
                            break;
                        default:
                            barLeft = -series.bars.barWidth / 2;
                    }

                    octx.lineWidth = series.bars.lineWidth;
                    octx.strokeStyle = highlightColor;

                    drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth,
                        function () {
                            return fillStyle;
                        }, series.xaxis, series.yaxis, octx, series.bars.horizontal, series.bars.lineWidth);
                }

                function getColorOrGradient(spec, bottom, top, defaultColor) {
                    if (typeof spec == "string")
                        return spec;
                    else {
                        // assume this is a gradient spec; IE currently only
                        // supports a simple vertical gradient properly, so that's
                        // what we support too
                        var gradient = ctx.createLinearGradient(0, top, 0, bottom);

                        for (var i = 0, l = spec.colors.length; i < l; ++i) {
                            var c = spec.colors[i];
                            if (typeof c != "string") {
                                var co = $.color.parse(defaultColor);
                                if (c.brightness != null)
                                    co = co.scale('rgb', c.brightness);
                                if (c.opacity != null)
                                    co.a *= c.opacity;
                                c = co.toString();
                            }
                            gradient.addColorStop(i / (l - 1), c);
                        }

                        return gradient;
                    }
                }
            }

// Add the plot function to the top level of the jQuery object

            $.plot = function (placeholder, data, options) {
                //var t0 = new Date();
                var plot = new Plot($(placeholder), data, options, $.plot.plugins);
                //(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime()));
                return plot;
            };

            $.plot.version = "0.8.3";

            $.plot.plugins = [];

// Also add the plot function as a chainable property

            $.fn.plot = function (data, options) {
                return this.each(function () {
                    $.plot(this, data, options);
                });
            };

// round to nearby lower multiple of base
            function floorInBase(n, base) {
                return base * Math.floor(n / base);
            }

    });
